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17 April 2024 |
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A BeppoSAX Observation of KS 1731-260 in its Quiescent State: Constraints on the NS Magnetic Field | | L. Burderi
; T. Di Salvo
; L. Stella
; F. Fiore
; N.R. Robba
; M. van der Klis
; R. Iaria
; M. Mendez
; M. T. Menna
; S. Campana
; G. Gennaro
; S. Rebecchi
; M. Burgay
; | | Date: |
11 Dec 2001 | | Journal: | v574 n2 pt1 ApJ August 1, 2002 issue | | Subject: | astro-ph | | Abstract: | We report here the results of a 90 ks BeppoSAX observation of the low mass X-ray binary and atoll source KS 1731-260 during a quiescent phase. From this observation we derive a source X-ray luminosity of sim 10^{33} ergs/s (for a source distance of 7 kpc). If the neutron star is spinning at a period of a few milliseconds, as inferred from the nearly-coherent oscillations observed during type-I X-ray bursts, the quiescent X-ray luminosity constrains the neutron star magnetic field strength to less than sim 10^9 G. If the quiescent emission originates from the release of thermal energy accumulated through deep crust heating in the previous accretion phase, then the measured quiescent luminosity requires a neutron star mass of more than 1.7 M_odot or a very long outbust recurrence time (sim 10^3 yr). The former possibility would be in agreement with the expectation of the recycling scenario, namely that the neutron star has accreted a significant amount of mass, enough to spin it up to millisecond periods. | | Source: | arXiv, astro-ph/0201175 | | Services: | Forum | Review | PDF | Favorites | |
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